Writing my blog post How-to: Search a Field in Table Designer I fully forgotten to mention that in a similar way you can search in C/AL Globals and C/AL Locals.
Be it Variables:
.. or Functions:
... or Parameters:
... or Text Constants - although in general this will not help you much as most (standard) text constants start with the letter T.
All you need to do is to:
Select all lines and press the same key againEventually the system will not deselect the lines and you can continue pressing the same key and in this way jump through all records with a name or data type or subtype (...) starting with that letter.